310 JR. S. Chittenden — Papoid-digestion. 



With the exception of the single experiment with boiled blood- 

 fibrin, all of the results show that the proteid-digesting power of 

 papoid is distinctly increased by the presence of boracic acid, at 

 least by the percentages of acid indicated. Consequently, it is plain 

 that the combination of boracic acid with papoid will not inhibit 

 the action of the ferment, but will, on the contrary, increase its pro- 

 teid-dissolving power. 



Influence of Acetic and Lactic Acids on Papoid Digestion of Raw 



JBeef Proteids. 



The 10 grams of moist, prepared beef contained 2*8508 grams of 

 dry proteid (110° C). The digestions were warmed at 45° C. for 6-J- 

 hours. 



WeiKlit of Proteid 



Reaction. undigested residue. digested. 



Neutral 0-9538 gram 66 5 per cent. 



0-5 per cent. Acetic acid 1-6115 " 43-4 " 



1-0 " " 1-5976 " 43-9 



0-5 " Lactic acid 1-3796 " 51-6 



1-0 *' " 1-6823 " 40-9 



The percentages of the two acids used in this experiment are 

 somewhat high, considering the strength of the acids, but the object 

 in view was especially to ascertain the probable effect on the ferment 

 of admixture with an organic acid, such as might be developed in 

 large quantity in the stomach in a case of strong acidity from 

 lactic or butyric acid fermentation. The results show that the 

 ferment is inhibited somewhat in its digestive action by the pres- 

 ence of these large percentages, although not to any very great 

 extent. Possibly, the addition of smaller quantities of these acids 

 might lead to an increase in digestive power over that of the neu- 

 tral solution. 



Influence of Lime Water on Papoid Digestion of Raio Beef 



Proteids. 



The 10 grams of prepared beef contained 2*707 grams of dry 

 proteid (110° C). The mixtures were warmed at 45° C. for 6^ hours. 



Medium. 



WeiglU of 

 undigested residue. 



Proteid 

 Disestert. 



25 c. c. Water 



0-7175 gram 



73*4 per cent. 



12^ c. c. Water 



_* \ 0*8076 " 



70*1 *' 



Here, the percentage of lime water was quite large, but the 

 object in view was to ascertain quickly whether, under any ordi- 



* A saturated aqueous solution of calcium hydroxide. 



